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20130416
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as the national transportation safety board takes a closer look at one fire in particular just days after the faa approved boeing's plan to get its fleet back in the air. dan springer is live in seattle. dan? >> reporter: yeah, jon. the faa approved the battery fix even as the company answers tough questions about the fire back in january that led to the dreamliner fleet getting grounded. the plane's lithium ion battery sured a short which led to the failure of all eight cells. boeing's new plan includes a redesigned battery that has more insulation between the cells to prevent what's called thermal runaway. the battery charger has been redesigned to reduce the total amount of energy in the battery so it doesn't work as hard, and it's going to be in a better steel containment box that won't allow oxygen to fuel a fire. the ntsb put boeing on the defensive this morning about its assumptions that turned out to be wrong. >> what we can't do is we can't account for every single possible method of short circuit, particularly what we would consider the unknown unknowns. >> reporter: boeing says it has
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